Differential Diagnosis for Red Erythematous Rash Under Breasts
Single Most Likely Diagnosis
- Intertrigo: This is the most likely diagnosis due to the location of the rash under the breasts, which is a warm, moist area prone to friction and irritation. Intertrigo is a type of skin inflammation caused by friction, heat, and moisture, making it a common condition in skin folds.
Other Likely Diagnoses
- Candidiasis: A fungal infection that thrives in warm, moist environments, making the area under the breasts a susceptible location. Symptoms include redness, itching, and sometimes a white discharge.
- Contact Dermatitis: An allergic or irritant reaction to substances like soaps, detergents, or fabrics that come into contact with the skin under the breasts. This could cause a red, itchy rash.
- Eczema (Atopic Dermatitis): Although more common in other areas, eczema can occur under the breasts, especially if the individual has a history of atopic diseases. It presents with dry, itchy, and inflamed skin.
Do Not Miss Diagnoses
- Breast Cancer: Although rare, inflammatory breast cancer can present with skin changes, including redness and swelling, often without a distinct lump. It's crucial to consider this in the differential diagnosis, especially if the rash is unilateral and accompanied by other symptoms like swelling or nipple retraction.
- Cellulitis: A bacterial infection of the skin and subcutaneous tissues that can present with redness, swelling, warmth, and pain. It requires prompt antibiotic treatment to prevent serious complications.
Rare Diagnoses
- Inverse Psoriasis: A type of psoriasis that occurs in skin folds, including under the breasts. It appears as smooth, red patches without the typical scales seen in other forms of psoriasis.
- Tinea Corporis (Ringworm): A fungal infection that can occur anywhere on the body, including under the breasts, though it's less common in this location. It presents with circular, itchy, red patches.